getOffset.js

function getOffset(element) {
	var left = element.offsetLeft;
	var top = element.offsetTop;
	while (element = element.offsetParent) {
		left += element.offsetLeft + element.clientLeft - element.scrollLeft;
		top += element.offsetTop + element.clientTop - element.scrollTop;
	}
	return {
		left: left,
		top: top
	};
}

getOffset.old.js

function getOffset(element) {
	var left = element.offsetLeft;
	var top = element.offsetTop;
	while (element = element.offsetParent) {
		left += element.offsetLeft + element.clientLeft - element.scrollLeft;
		top += element.offsetTop + element.clientTop - element.scrollTop;
	}
	return {
		left: left,
		top: top
	};
}